The standard outlines the specifications for production, classification, dimensions, testing, and acceptance of asbestos cement pressure pipes intended for light-duty use. It includes details on Class 5 and Class 10 pipes with nominal sizes between 50 mm and 200 mm, emphasizing hydraulic performance, dimensional accuracy, joint flexibility, and quality assurance. This code is vital for professionals involved in water distribution, irrigation, and related infrastructure requiring robust, pressure-resistant asbestos cement piping.
Overview
The standard outlines the specifications for production, classification, dimensions, testing, and acceptance of asbestos cement pressure pipes intended for light-duty use. It includes details on Class 5 and Class 10 pipes with nominal sizes between 50 mm and 200 mm, emphasizing hydraulic performance, dimensional accuracy, joint flexibility, and quality assurance. This code is vital for professionals involved in water distribution, irrigation, and related infrastructure requiring robust, pressure-resistant asbestos cement piping.
Audience
Contents
Structure
This section defines the applicability of the standard to asbestos cement pressure pipes with nominal diameters from 50 mm to 200 mm, detailing thickness, diameter, tolerances, and pressure relationships.
Covers relevant references such as IS:2-1960 for rounding rules and dimensional specifications for pipe thickness and external diameters.
Details classification based on hydraulic test pressure, highlighting classes 5 and 10, with limits on working pressure relative to test pressure.
Specifies tolerances on external diameter, thickness at pipe ends, and nominal length ensuring dimensional accuracy.
Describes thickness, diameter dimensions, physical properties, and quality requirements for materials used in pipe manufacturing.
Outlines test rounding off, test cost responsibilities, physical property tests, and hydraulic pressure-tightness tests.
Explains permissible joint types, flexibility requirements, hydraulic pressure resistance, and angular deviation allowances.
Specifies mandatory marking details including manufacturer identity, manufacture date, nominal diameter, and pipe class suffixed by 'LD'.
Describes sampling inspection methods, lot size criteria, inspection requirements, and allocation of test costs.
Details the certificate content, optional purchaser witnessing of tests, and cost implications for additional testing.
Clarifies inspection methods, lot formation based on diameter and class, and acceptance criteria with associated test cost responsibilities.
Discusses the application of the ISI certification mark, its regulatory framework, and the assurance it provides regarding product quality and conformity.
Frequently Asked
IS 9627 defines nominal pipe diameters and thicknesses for light-duty asbestos cement pressure pipes in Table 3 (Clause 4.5). Typical diameters include 75 mm, 100 mm, 150 mm, 200 mm, 250 mm, and 300 mm with corresponding thicknesses ranging approximately from 5.0 mm to 9.0 mm. Pipes usually have a length of about 3 meters, and thickness increases with diameter to ensure adequate pressure resistance. Refer to Table 3 in IS 9627 for precise values to comply with design standards.
IS 9627 defines two main hydraulic pressure classes: Class 5 with a test pressure of 0.5 N/mm² and Class 10 with a test pressure of 1.0 N/mm². The working pressure should not exceed half of the test pressure. The hydraulic pressure-tightness test involves applying the designated test pressure for 30 seconds without any observable leakage or surface sweating. Alternatively, the test can be conducted for 10 seconds if the pressure is increased by 10%. These procedures ensure pipe integrity under specified pressures.
Permitted joints include asbestos cement couplings with rubber sealing rings and cast iron detachable joints fitted with rubber seals, bolts, and nuts. Flexibility is ensured by allowing joints to withstand the specified hydraulic pressures and accommodate angular deviations up to 8°, or a minimum based on the pipe's external diameter divided by 1170. This flexibility prevents leakage and damage from minor misalignments. Joint dimensions and tolerances follow manufacturer specifications, with pipe ends shaped accordingly.
The standard requires 90% of pipes to be within ±20 mm of nominal length, while up to 10% may be shorter—one-third up to 1 m shorter, the rest up to 0.5 m shorter—with additional joints supplied free for short lengths. Straightness deviation limits are specified as 5.5 times the length for 50 mm diameter pipes and 4.5 times the length for pipes between 80 and 200 mm diameter. External diameter tolerances are ±0.6 mm at joint locations, and surfaces must be free of irregularities affecting water tightness.
The ISI Certification Mark may be applied to each pipe by manufacturers licensed under the Indian Standards Institution (ISI). This mark certifies compliance with Indian Standards, indicating that production follows a strict quality control system under ISI supervision, including ongoing testing and inspection. It assures users of product reliability, safety, and quality. The use of this mark is governed by the Indian Standards Institution (Certification Marks) Act, requiring manufacturers to maintain continuous conformity.
Ask AI about any clause, requirement, or provision in IS 9627. Get instant, clause-cited responses powered by our indexed library.
Free tier includes 150 queries (50 AI + 100 Reference) · No credit card required